Advertisement
3.0
Maintenance
The only maintenance that may be required on the DFC-A is fuse replacement. Replacement of the fuse
requires first removing dc power, then opening the enclosure. The enclosure must be re-installed to
maintain the IP rating. The enclosure may be opened by inserting a flat blade screwdriver under the
retaining tabs in the base (See figure 2).
Figure 2
Enclosure Top Removal
4.0
Follower Arm Applications
4.1
Electrical Connections
Figure 4 shows the connections that are required for the basic follower arm system. They are:
24 vdc power input
Current-to-Pressure Transducer or a motor drive in torque mode
DFP or DFP-2 roll diameter sensor
10 kohm tension potentiometer
All inputs and outputs have the negative lead referenced to ground.
4.2
Sensor Setup (See Figure 3)
The DFP or DFP-2 position sensor should be at the center of rotation when the follower arm is halfway
through its travel. This is an approximate adjustment and is intended to center the sensor position to
allow maximum rotation in both directions during operation.
DFP
Adjust the DFP sensor shaft so that its keyway is pointing towards the top cover when the
follower arm is half way through its travel.
DFP-2
To find the electrical center point of pot rotation, use a digital multimeter type ohm meter to
measure from the white wire (wiper), to the red or black wire. Turn the potentiometer shaft
until the meter reads 500 ohm. Install the DFP-2 sensor so the meter reading is 500 ohms
when the follower arm is halfway through its travel.
DFP
Follower Arm Setup
2
FULL ROLL DIAMETER
CORE DIAMETER
Figure 3
Advertisement
